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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f3a2f5401c1e7f8e9ca0d03b8ec15935471fea29a85e5ff69ff5623d1db48a' 
  AND token = 'wTWbeMLWiF094p59DmdunArJxRiKUWk2smwKDcyaGZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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