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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e07761343a8024caa6e753afb8a272e03d724b5fdd99e7ebe71cbbeae67c84bf' 
  AND token = 'fwcQzhdy40wi2vcEw6nmgk8jL8R6B877/3GTD9+d+IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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