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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f674020cc8b72d12e1dea7c3b62fc04bf09d2d46618b1e74de71b3023ac83383' 
  AND token = 'GZsynJe8ifStUqOKtUlAtv8QPTC62rsEQqqHaCaL7B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00096

JSON explain

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