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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '265d8408d9e7f90d1dfbc6561b54df1fa1d9fd49bfc9d735b7627b363e94df68' 
  AND token = '3u0bpHMmhBlFN15meeBuHtdUHQ0umI2MhP+d4TawcFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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