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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a8b6e49e015cbd94bc23550cf89871af700a5251850ad5248df8dbe1dae26d3' 
  AND token = 'mabsBDo/8zVEgFtW84rgaEWzev2PQ3OlN/rVKqigs1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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