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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45f515b797cce18bae7f16a41d95e3f620996eab8e01f49138177f31a4bc6779' 
  AND token = 'TVKWAV4Dl89u3qcOmm1id/JH7lUEeaNvqPe9OIvIcE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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