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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf092dfa02c149a8af809b6bae4ddb6af18fd8665d8f29a990261d51ee83525' 
  AND token = 'UbLcMFKlj8mlO8Vmi1jNFi1ZVohvI+6Y+jkUVaFhEug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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