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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2032c62aad12c2a74f16adaaaa84645c5f4f045ade67048b9cb5a0e7b704eda8' 
  AND token = 'xxbNeSRpe51aEd9QZDwek4ZvAZ5Fhd0zJc7qHfH70/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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