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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '498dcb864466a29cb4e2db12a24a8d8ba938570cb8af0169c22b01243b70fc61' 
  AND token = 'WJDBO3BjUVolfkQ2Z4sLSZCqEEhzRMYeZozIzc0QY+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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