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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd66e21325d4a3553b1f4edeb555bbd490ddf6751639d6d6aae4d13b21fcee1d4' 
  AND token = 'iT4MeoeDvW83uV2GXLTTw6/DaTbkIfyI6Wf2q1U2/NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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