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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65fb8ed7b3095b8f7aeccb54968e5da7638084b3e4bbceef8c7aba05ba64b69e' 
  AND token = '/6RVns/7Ksgdz4StjbHMUb7Z08mXOaDocCjKYzxBPmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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