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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88c451f88c52870e8820792e7a84e34d0cb2741b708a8f862f754b3ba05f800a' 
  AND token = '3ySUkzb0y03XnXUOxI8OAvpRZiXxVwUqPv+jw7pdA/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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