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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '051fe0d7b4a2c0fdd6836325270017667aa122294c4c4f9040345a6d511aaca7' 
  AND token = '02+bHsyn8F3ZXzzTXvvCLGUpcveQFotaIDb9TY90qJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00249

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}