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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7658908a8699ea2e02fcc82848a710288b23ee0cefee5187a350621b1b6689b' 
  AND token = 'J2uupB8KY/KaNm88Od9Yx5LKdAdVOhX5SiKLJ2ImyKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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