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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '840008a86589be59b96edb4b629711d980797f359952c8de774856bae0c3e39c' 
  AND token = 'gM1gJ7kyh2lmkVmPZ+bmC6IKzghml61SWr72eXbTaJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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