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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb440900f0adf7e6b551e2eba62f493b6111b96789108ee5c6338b526467d00c' 
  AND token = 'wl6lKK2M3cWTA0CDZ3+YNL4kSyVfCwPsRhBwsVrjnPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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