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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b3ae9976775b1eec8fb924996add5c17eb71f8c3f27dd585422819c059b4d6' 
  AND token = 'IRTeQ4aIB7mjAALnBA9M9pqdDFL3AUYhvP+j9Nu52H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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