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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6133692c19ecdcd1d1492c50319ff9371be3ff8f233e160c7b3c70241c66653b' 
  AND token = 'AKvLojOd/oumoHy/+G8fUWLPl7l+ZJEtEgsYMK0NG0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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