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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd633dd77538f663516f442c5e2cfe3b064c92983f24d25c85d6dfa69fcf8da8d' 
  AND token = 'ZNUaVAvIllt3Lg8bURm0SVzB9pFnAdiiA3AHdUbZg3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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