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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd98108bf13dae0f20b104b317bfbd5d3944c9a1d463115d1323fa9fd0986846e' 
  AND token = 'yZD0hHHJmSG3xuKYX7/IN/x1cuLfdPvTeMTZUC1cpNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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