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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92822af78e5d1bd09194c1d5fa2c335e94a2819000f7b36ea49d9ace98342ef0' 
  AND token = 'N0xNMiE1ZV+C4e2Ne4CnRLEgjzO6hGRd+Gsamkmkdfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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