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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dcaebc2f7db010051a682439748f55ca7dbad8c144a115cc557e0c3b6ee5b5b' 
  AND token = '9qoU9If2BKxF7Kyx3sRq9kFcyEWy8lpLWrZ81RWEd0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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