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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cd9babf0375970d08e5ae3c184695d1cbde4ce12ee3d233d2d7b94650e6f618' 
  AND token = 'cHgky78gia/hL0xir6KaCFhsMnmed80HwusofuJFG2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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