SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22b22ccdca648cfe9f341059051d5766d415f761b9306b22bafa3be0a205c218' 
  AND token = 't578w5Vx8UQF/vW+jnwOUwQS8zKsboZ1IOvwd46phmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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