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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2d349e16bfdb6065e51af90704e98288da819635e5487fb0ac7ad90de08cbf8' 
  AND token = 'IP/cCPukmeicrNWLwIIQJM77Z3WOv/2xfkDKIOZkif0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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