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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b3a139dc6045ecb5edf7435b5cbd79168cca92acf4bede88429ff73a5a2d1c1' 
  AND token = '6zznOEP63qoXtNWsj0s5m4Yyc0zZYhaOKRFc1WMvYKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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