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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d217b6784b57a371b8167a55164870ff1e10eece52a5bc399e9a7f63f26af3' 
  AND token = 'NZl5nVze63Fz4U1YouAPG9Ao+by3TTQUbBLEiUdSnjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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