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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fce34780a9b2bc47e7fef4b48fe63cb7d25ebb1e890dff21919d1e32dd42ef8' 
  AND token = 'zTK5Q915DThwxdkIzWBruW8cwGU+Wwnyfw6Xl6gD4Hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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