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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f415cde877abe9b4d8289a5034c58c188baaa79ae051ba6bfc94785f040e3809' 
  AND token = '6qDKfTFB7hlKJ8mC9Gbu4SEkFwoAPgQsmn0nvBCqkWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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