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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ed54d26448c8bfb70c4deb5d86d6391cad7888cc6e240e7e0c71581ec18953d' 
  AND token = '9Q7KtRSKHvqSSwrKqoWHjoZ5fSg2qjqdB2SQ3O6UXt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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