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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f1c85add6b7718e1bde6685636c11038d8d9749cbce54c42021eebfcfed22b9' 
  AND token = 'ZchxW1F1f5LvpKKaCqR8ZLaXsANDIF0l8VGL98tdWqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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