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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd451a1d337373e0af36d88dc8de4ec532f6c85562176d1523582e7a07d2444ad' 
  AND token = '13yfWMXycUMCenX5xv2PCsV9u/Ii/FzIFsUnOKVUTxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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