SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0faa8e5f26d8c143b78d55bfc98392285085dc6279bd38d780896de527b66fb0' 
  AND token = 'SNji5hCOvWuXCNTJY2lDT2f6ld/q7vYZQGRN1FrupAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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