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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a28345e7926dc136fc32e941d29511509bdda690f0f24230d3de07f0d227ec47' 
  AND token = 'aGIcV2ug3XTqMJAP/mxwv3U1tfkMyimKwKysI8P0cEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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