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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05e4a5e7b33e4af7aa05c2dc8a9bb3945194ba77e0f7eafc3763a819341f8f4e' 
  AND token = 'yW4HzpPO79bGMzVWshf6rfGWNI+FTNukdOE3Y+HIYOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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