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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae57b50f98ebc2004f6ad102c38e8d2f43aabcce3951ae9ee43e9afbf68e5d4e' 
  AND token = 'xLD931nlwBz7jv2+eFg/qNfH8gZAaycfSWwFZXG9UEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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