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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83011e467f17616479c3532f45c2d47dddee5a00fd4116f53a85c0699e6f5356' 
  AND token = '/MjYSiMVXyKK3YAS8OXMasHc11kCWA2GVPrDFVVZOzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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