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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1795cfe461ea1778b81b36038c4de219938e21941d6d25882d7daf6ceeeee360' 
  AND token = 'mcMh0enX0uHxcqlUbUpdRXDwUC7g2C5m36b+/IFalnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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