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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34fe8a709a2bf6c1c17fb0e98ce14070dfa07bbc3247834dcb9e896e7f407eee' 
  AND token = 'f+YbmTaj3l8zqg2QxwwSvp5trbyTDlOmegZlzH1ra+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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