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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a6b42b2bb01f5ac9155964e33cbd9176fe01997cc3c6c7b5f52e1524fcd71d' 
  AND token = '/PkeX+OloMzwXe6jDupMCV+/yZoMYG26yd/SfOT1rEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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