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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c818ca5c400f86b658e10546daff89543b81f64c63c9acf054e70cb838fc23' 
  AND token = 'BPJMJ5NBIrpRoStkjEjQ8kKhY9PVsKMM3hx2BYEi5l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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