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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be0bb3046e4398c783bbf5cdb5ee12a051db281f7ce3f3d6d0a99a3b7492b6aa' 
  AND token = 'urgAMYNwCGeS9Yv3q7g3PyhtqEVPl7DSkkTUP8wxKHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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