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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bf87ea600169bbd3832cd7152f5fe28e12993f2bda423f62ba86d7004b6f259' 
  AND token = 'L600XHmmHBqurBw8xUBoXs/v+SqA3u8knZTNjXXnPeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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