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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1744c9a678791ba290ab0ac5f8ba2db9a4dee7c943b72f3777b190824e63666' 
  AND token = 'Y1EMuntmzLHB7v4yHaX3mJe3hfz+Z5DMfuYvGRM6KJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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