SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d3fd18b22c7593af5889c3125d771e5f9bb47a7e0c8bf89d15ec01dba29e475' 
  AND token = '+uV4CZo4+nCDN2/VFX2ARTNE2CbTP3y1pprTa0hDVvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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