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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca4d52d6c442ccced01c410671deda4cc124e6b0c44c77487b28b6f5f8b4414a' 
  AND token = 'ncrXW2X2zX28WkvvO2SM0cbzPB26PiKJ29BGVz4Vf98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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