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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97bd2ab9b6e09cdd62d1c0d268df7458e9bf005f7df5ec427e43848c8a95043d' 
  AND token = 'A/IuRCesbeL6xReARJHT5wNvCS7eedI343ZIFriWqBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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