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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dd1fa9cdc78df8a636261a544dd5d68bd92d2b82b6c8ed6e6169a1fe33a1191' 
  AND token = 'dacjXqlHlAmePYpXKfgfuYY2/v7IkWoBw8bA+daLeQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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