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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28fd1ffbd89670c86b5f7fa72ca48c1f1e70f2f8fdcb2487199705a7579a6a6d' 
  AND token = '/iWsQNlszLIrfOfKgLNuLWRwHgJfpypX2TA+m5gnGdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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