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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be9ff1732148f9fdabe269d437fde00caf0ecddc2d7fac4ba9721b6b90f5f0e4' 
  AND token = 'fa1jgMZkXCT/vxCnbEueyWsbHWbXdpHRvey6Cpp5+4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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