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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f78c2f4e9aab8c8fd92b1e99072c2b14f8253ccab0fbac6f1a6d691999add8ae' 
  AND token = 'jNebrfXsrA3Ok5kqj7xYturwCdSJzRahUf/AXpgR34A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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