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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8102b44d8d29f871577a7ecceb63a85c3b33f025ea8370374bdc7f2cfab9029' 
  AND token = 'lT/5t/4sIJwyW+P+X16Y2pa5JVy3RctnKRdup74eYNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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