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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfb9079be17b3ed26c264d36ac3529bd448ea3598afda9c8c6ad10fbfcd1b9bb' 
  AND token = 'Lz7S1f6gFifLpGeN2cRHM9RodapLIK7aX5dKdUUZKUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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