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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1fd6f44591003cba2bb5dd0314f824d02dedac6cc69b5097c8a46b38beeec99' 
  AND token = '5fgGpMKIf+0L343IAJHN0q5tCFHLQFGvUDPK9vM+EF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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