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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae4a9038e2fdfd23cd7c2230e06efc1da44bd1ad978789a493e7e03cc5fe19f6' 
  AND token = 'QCnUiVTJ9Yd9SMpq/3EYD3PgaBxDLYj8Rl9+Ek8nSBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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