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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f40f2f9e780e24cc6fa0948cc2e5a05a426b3ba7b02fcc97476a40aae88c5436' 
  AND token = '2BKZIGy8HaVZk4cyRW0x9/AP8J1j2efrJ6gfaz2yWZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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