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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41afc7ad3b6f98b7ba2c24bda441f91ef98f9afac739e5587d6f267252e1d2e6' 
  AND token = 'ArLVY2RcCc81LJ3956dpRXzsgranI5QQxc8wOlPAhlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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