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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd80edc8b25a0f2704671c2c86d9b049162f612338d1121c999a443bad50edc41' 
  AND token = '5BugW4cp5V0HXD8oBYLtS5FZxfkgAr14RJQhWTV1wk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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