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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee4d222e897c770f0af556dd5621a89c3c81b84ab72a2b3b13ded4f9700f8d50' 
  AND token = 'gxFwGk0q/2M2ENlsP6vbV8Zt+reOb6kbP1TTuhCLc0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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