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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4e609b145a9d655de3ffecf6eacc110d645710da1eb2b1019b244d4523abb6a' 
  AND token = '9W2E7oKZw2Ee6dFKXtGBdygH8dqMEn4IaeHUiZ5knzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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