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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb0bf59cc4565a502f6fc38959ca4800d368bad0270134006b0a51eb1947ab16' 
  AND token = 'cfM0A+ON/1U3Cvmm2UmViV4YAfPbQvm/eJZ+cxHFYuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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