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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04f9c839678b639ce67de20a13e4e94fded5200dbd8308e0ddc5d85c9122d83e' 
  AND token = 'PL7wfPQ/Ldpnsgk5jaqzc8hoAJA2fvm27RatyU4BmZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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