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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e946b7e0ab4187ac7201933abc1bac36b34b9996dfff7dc7b5a6b78db29c16e' 
  AND token = 'LIprVUNfMHE12igzDnASzIYdLRf2Rcdw7fufRihLos4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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