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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd51fdad9bfe0759820126c3913767ecbd4a7f4627886416845001bf8e76f944d' 
  AND token = 'HawdGepTlvhJKIf3xia135Ou3r6hMFSqF95F4JXAi+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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