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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a51c8efb5f2363c9f7784471e3023f9893d418aa431f59db16d336f297c6849' 
  AND token = 'QMkrF3V92Bts8UB52e5E5W0vI+Qw3HttuAVgFLtCB5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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