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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '782dbab10ab3ea8651f640239b81b7660bbd2fa37d6fc3b595ebdb6e19642d95' 
  AND token = '1ZBm0GfwTXciVeptkXiys4kpEvtoa2+LnCDV4v45Bpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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