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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9983cee8a52aac4533cf79f0b076a86cab801b93f9434959c6ed1e70cc370b4c' 
  AND token = 'v36HOUoW8zURw7GvBmhfNKWyiOqRdvWGOQSy5zDCf5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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