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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10b67cb071bce61b9ca94c4ac35e8752032e0696d6ad7f85feab997d55bee406' 
  AND token = 'rXiVRaK0jZoyYHSVePBT14SSC/yhQRSV5Oe0GD2jP+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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