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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '675e01f484c81d35dee22996574df14bd1238d0832350a2fd20af199b939dd5f' 
  AND token = 'yr0UKuWoeNOUnlo8nsldT4bA3IW/rJA03DfdKeo7ws4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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