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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a033cdd9a92e74ce286ef1b730cdc0652248d4e6befe858aa593c4600175701' 
  AND token = 'GUmynAu8em/POOwOCm0m3F0qoSnUv5WCpIAdbckGylY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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