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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77cadb0b99a86bd0ace53fc31c02bf16aec3333a990e273041a8a9c439cb6773' 
  AND token = 'zncf0sHgzBIdGkQIDuOYQ3TxM0mlboKbod5R93cgeYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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