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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c254a5bc7dcd290cc1b0a5d05e2e13c624da8b451a5e7e5d447d48411fff40f3' 
  AND token = 'bW55RwdgheRKjYwEmcO3AVrb2IJidSqyI3V9BjFm5Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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